Table 5.
Antibacterial reduction rate of PLA NF filter media containing manuka triketone (5 wt.%) against S. aureus (ATCC 6538P), E. coli (ATCC 8739). and K. pneumoniae (ATCC 4352) tested according to ISO 20743:2013 [43]. Reusability following 5 and 10 laundering cycle according to ISO 6330:2013 [49] and ISO 20743:2013, was confirmed for the PLA NF filter media when tested against S. aureus (ATCC 6538P) and K. pneumoniae (ATCC 4352).
| ISO 20743:2013 |
S. aureus (ATCC 6538P) |
E. Coli (ATCC 8739) |
K. pneumonia (ATCC 4352) | ||||
|---|---|---|---|---|---|---|---|
| 0 Wash | 5 Washes | 10 Washes | 0 Wash | 0 Wash | 5 Washes | 10 Washes | |
| Control | Initial | Initial | Initial | Initial | |||
| Log CFU | 4.69 | 4.69 | 4.83 | 4.80 | |||
| Contacting time (hours) | - | - | - | - | |||
| Control | After contacting | After contacting | After contacting | After contacting | |||
| Log CFU | 7.25 | 7.19 | 7.3 | 7.6 | |||
| Contacting time (hours) | 18 | 18 | 18 | 18 | |||
| Log CFU samples | 2.33 | 2.87 | 3.1 | 3.83 | 4.55 | 4.82 | 5.11 |
| Percentage reduction samples (%) | 99.999 | 99.996 | 99.993 | 99.957 | 99.82 | 99.834 | 99.678 |
| Log reduction samples | 4.92 | 4.38 | 4.15 | 3.36 | 2.75 | 2.78 | 2.49 |